Word has it that there are 100 boxes of records in the National Archives stored under the record group  472.7.1 - Records of corps-sized organizations - Textual Records: Correspondence, daily journals, reports, issuances, and publications of I Field Force Vietnam, II Field Force Vietnam, and the Capital Military Assistance Command, 1965- 72.  I live in Spain and some day I will manage to get to the US and go through them.

In the interim these are the only records I have been able to find:

C.M.A.C. Unit Brochure - Sentinel to a City 1969. (.pdf version) (Word version) Source: Finnegan

C.M.A.C. HARPOON - First Issue, 31 October 1968. Source: Tom Krock

C.M.A.C. HARPOON - Volume 2, Number 2, 15 January 1969. Source: Brian Wickham

C.M.A.C. HARPOON - Volume 2, Number 3, 31 January 1969. Source: Brian Wickham

C.M.A.C. HARPOON - Volume 2, Number 5, 28 February 1969. Source: Brian Wickham

In Defence of Saigon article. Source: Brian Wickham

Uptight Winter 1969 magazine cover. Source: Brian Wickham